velveth_127_long command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

velveth_127_long: command not found

or when using sudo you get the following error message

sudo: velveth_127_long: command not found

Solutions to velveth_127_long: command not found

How To Fix velveth_127_long: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu velveth_127_long is provided by velvet-long package.

velvet-long is:

Velvet is a de novo genomic assembler specially designed for short read sequencing technologies, such as Solexa or 454, developed by Daniel Zerbino and Ewan Birney at the European Bioinformatics Institute (EMBL-EBI), near Cambridge, in the United Kingdom.

Velvet currently takes in short read sequences, removes errors then produces high quality unique contigs. It then uses paired read information, if available, to retrieve the repeated areas between contigs.

This package installs special long-mode versions of Velvet, as recommended in the Velvet tutorials.

To fix this problem, we can install more using the command below.

sudo apt-get -y install velvet-long

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install velvet-long.

sudo apt -y install velvet-long

Or if you have aptitude installed you can use the following command.

sudo aptitude install velvet-long

Summary

In this tutorial we learn how to fix velveth_127_long command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.